Table 2.

Variation in SF-36 summary scales scores at baseline

	Regression coefficient	95% confidence interval	p Value
PCS-36 scale†
PCS-12	0.938	0.833 to 1.043	<0.001
Sex	0.276	−1.403 to 1.956	0.747
Age	−0.049	−0.133 to 0.033	0.240
PCS-12*age	0.001	−0.001 to 0.002	0.553
PCS-12*sex	−0.009	−0.051 to 0.034	0.698
MCS-36 scale‡
MCS-12	0.948	0.851 to 1.046	<0.001
Sex	0.606	−1.157 to 2.369	0.500
Age	−0.032	−0.115 to 0.052	0.459
MCS-12*age	0.001	−0.001 to 0.003	0.257
MCS-12*sex	−0.008	−0.047 to 0.031	0.701

†R²  =  0.92; ‡R²  =  0.93.